Door-check.



No. 68l,426. Patented Aug. 27, l90l.

P. VINCENT.

DOOR CHECK.

(Application fllad May 6, 1901.)

(No Model.)

I over L'o r:

UNITED STATES PATENT OFFICE.

PYWELL VINCENT, OF PORTLAND, MAINE.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patet No. 681,426, dated August 27, 1901.

' Application filed May 6, 1901.

TO all whom, it may cancer-n- Be it known that I, PYWELL VINCENT, a subject of the King of Great Britain and Ireland, andaresident of Portland, Oumberland county, State of Maine, have invented certain new and useful Improvements in Door- Checks, of which the following is a specification.

My invention relates to a door-check such as is applied to -doors to relieve them of the jar when they are automatically shut by the use of a spring, and while it is particularly designed for screen-doors it may be adapted to doors of any description.

In designing an eficient doorcheck for screen-doors it is very desirable that it should be of simple Construction and capable of being cheaply made, and it is largely with this in View that the present invention has been made.

The invention consists ot' the arrangement and conbination of parts herein after set forth and claimed.

I illustrate my invention by means of the accompanying drawings, in which- Fgure 1 is a View looking upward, showing the door and the cylinder and pl unger in section. Fig. 2 is a front elevation. Fig. 3 is an enlarged section on the line :Ju a: of Fig. 1. Fg. 4 is a like section on the line y y of Fig. 2, and Fig. 5 is a 'section on liney y of Fig. 4. i f represents the door, and f' is the door-casin g.

As shown, the checking-cylinder is pivotally secured at one end to the lintel above the doorway, while the plunger is slidingly connected to the door adjacent to said lintel.

A represents a cylinder, shown as made of thin metal, having an ear a, by which it may be pivoted at its rear end to the casing adjacent to the door, said cylinder having one open and one closed end.

A plunger B is provided for the cylinder, here shown as solid and nearly as large as the cylinder. Washer a and the usnal venting-screw a' is provided in the closed end of the oylinder.. i Pivoted to the plunger B at a point which is within the cylinder when the plunger is at its inner position is a link C, connecting at i It has on its inner end a suitable a Serial No. 58,855. (No model.)

its outer end with a sleeve d, adapted to slide on the guide-rod e. The guide-rod e is secured to the door in a position parallel with the cylinder A by means of brackets e', so that as the door is swung back and forth the sleeve will slide on the rod. As here shown, the link C is contained in a slot or recess forned longitudinally in the side of the plunger, so that When the plunger is in the link lies wholly within the plunger, the outer end of the plunger being coincident With the outer end of the link.

For the-purpose of noving the plunger in in and out of the cylinder I provide an arm g, one end of which is pivoted to the casing between the cylinder and the door and preferably a little in the rear of the cylinder, the other end being, as hereshown, loosely secured to the outer end of 'the plunger. (See Fig. 5.) The arm g may be pivoted to the plunger, but the pivotal movement is so little that it is only necessary to secure it loosely, as -by passing it through an opening in the plunger.

For the purpose of holding the door at a certain point and to prevent it from swing-` ing clear open I hold the upper end of the link within its seat in the plunger by means of a spring-clamp h, which consists of a bent spring Secured to the side of the plunger and bent around so as to bear against the side of the link, where it lies in the recess, so that it will require the application of some force to remove it.

When the door is swung open, the action of the arm g will push the plunger out of the cylinder, the rod e slipping easily through the sleeve d. When the plunger is out as far as it will go, which will be when the cylnder has swung over adjacent to the pivoted end of the arm g, the door as it continues to Swing will exert a pull on the end of the link, tending to swing it outward from its seat; but this pull will be resisted by the springclamp h, so that the door will ordinarily be prevented from swinging entirely open. It', however, the door is moved farther, the upper end of the link will Swing out from the plunger and allow the door to swingfully open.

W'hen the door is closed, the reverse op- ICO eration takes place, and the air in the ey1inder forms a pneumatio bnfier in the usual manner.

It Will be understood that the door is closed by means of a suitable spring not here shown.

A door-check constructed on this plan is simple and efiectiVe and can be manufaetured with little expense.

I claim- 4 4 1. The he'ein-described door-check consisting of a cylinder pivoted by one end to the easng, a plunger for said eylinder, a link pivoted to said phmger at a point within the eylinde' when the plnnger-is at its inner position, a guide-rod Secured to the (1001' parallel with the oylinder a sleeve adapted to slide on said rod and pivoted to said link at its outer end and an arm pivoted to the casing between the oylinder and the door and Secured to the outeend of the plunger to operate the sane.

2. The herein -described door-check consisting of a cylinder pivoted by one end to the casing, Et plunge' for said cylinder, a link pivoted to said plunger at a point within the eylinde' when the plunge' is at its inner po- 'longitudin'tl recess in one side, a link normally eontained in said 'ecess and pivot'ed to said plunger at its inner end, a guide-rod Secured to the casing parallel With the cylinder, a sleeve adapted to slide on said rod and pivoted to said link at its outer end and an arm pivoted to the casing between the cylinder and the door and Secured to the'outer end of the plunger to operate the same.

Signed at Portland, Maine, this 2d day of May, 1901.

PYWELL VINCENT.

Witnesses:

HARRY B. RUSS, S. W. BATEs. 

